What was found in Mount Kisco's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 1460 µg/L 15% of the EPA limit 10000 µg/L Highest in the city: RAMLEH WATER WORKS CORP. INC. · 80 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 1384 µg/L 14% of the EPA limit 10000 µg/L Highest in the city: RAMLEH WATER WORKS CORP. INC. · 80 people · 2017 | 1/2 | SYR4 |
| Fluoride | 549.55 µg/L 14% of the EPA limit 4000 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Copper | 205.8 µg/L 16% of the EPA limit 1300 µg/L Highest in the city: RAMLEH WATER WORKS CORP. INC. · 80 people · 2017 | 1/2 | SYR4 |
| Barium | 150 µg/L 7.5% of the EPA limit 2000 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| TTHM | 62.3 µg/L 78% of the EPA limit 80 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Chloroform | 49.62 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 45.28 µg/L 75% of the EPA limit 60 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 26.62 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 17.79 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Lithium | 13.6 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2024 | 1/2 | UCMR-5 |
| Bromodichloromethane | 11.055 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 9.75 pCi/L No EPA limit set Highest in the city: RAMLEH WATER WORKS CORP. INC. · 80 people · 2018 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.869 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 3.584 pCi/L 72% of the EPA limit 5 pCi/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2018 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.452 pCi/L 23% of the EPA limit 15 pCi/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2018 | 1/2 | SYR4 |
| Combined Uranium | 3.10367 µg/L 10% of the EPA limit 30 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2018 | 1/2 | SYR4 |
| Dibromochloromethane | 2.813 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 2/2 | SYR4 |
| Chromium | 1.6 µg/L 1.6% of the EPA limit 100 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1 µg/L 18% of the EPA limit 6 µg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.6125 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0031 µg/L No EPA limit set Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: MOUNT KISCO WATER DEPARTMENT · 11,187 people · 2025
Highest in the city: 0.0020 mg/L — RAMLEH WATER WORKS CORP. INC. · 80 people · 2025 | 2/2 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Mount Kisco
| Supplier | Population served |
|---|---|
| MOUNT KISCO WATER DEPARTMENT | 11,187 |
| RAMLEH WATER WORKS CORP. INC. | 80 |
Frequently asked questions about Mount Kisco tap water
Is Mount Kisco tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Mount Kisco. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Mount Kisco?
2 public water suppliers report drinking-water monitoring for Mount Kisco, New York to the EPA. Each is listed above with its population served.
What contaminants are in Mount Kisco's water?
The contaminants EPA monitoring detected in Mount Kisco include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.